JetBlue Airways is not done yet trying to acquire Spirit Airlines. With just three days until shareholders vote, the New York-based carrier has upped its offer again, raising its reverse breakup fee to $400 million to beat rival bidder Frontier Airlines.

JetBlue’s latest offer — its fourth for Spirit — also includes a prepayment of $2.50 per share of the breakup fee, and a “ticking fee mechanism” where the airline would pay Spirit shareholders an additional $0.10 per share monthly from January 2023 until the deal closed, JetBlue said Monday. The ticking fee could increase JetBlue’s overall offer to as much as $34.15 per share. Its last offer was for $33.50 per share plus a $350 million breakup fee.

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“We’ve discussed our offer directly with Spirit shareholders and are now modifying our proposal in response to shareholders’ expressed interest, to include a monthly payment for shareholders, with the certainty of a significant cash premium at closing,” JetBlue CEO Robin Hayes said Monday.

And, in a letter directly to Spirit shareholders, Hayes said the airline’s board has “never negotiated with us and have now favored a transaction that better serves Frontier’s controlling shareholder than Spirit’s shareholders.”

Frontier’s latest offer, unveiled on June 24, included an additional $2 per share for a total of $4.13 a share, plus a $350 million reverse break up fee. The offer was valued at $2.7 billion based on closing stock prices that day.

Spirit shareholders will vote to accept or reject Frontier’s offer on June 30.

Tags: frontier airlines, jetblue airways, mergers and acquisitions, spirit airlines, spirit takeover